Fix vmaf model name

fix-vmaf-model-path.patch

@@ -16,7 +16,7 @@ index 4d49127efc..bd6f4519e8 100644
  
  static const AVOption libvmaf_options[] = {
 -    {"model_path",  "Set the model to be used for computing vmaf.",                     OFFSET(model_path), AV_OPT_TYPE_STRING, {.str="/usr/local/share/model/vmaf_v0.6.1.pkl"}, 0, 1, FLAGS},
-+    {"model_path",  "Set the model to be used for computing vmaf.",                     OFFSET(model_path), AV_OPT_TYPE_STRING, {.str="/usr/share/model/vmaf_v0.6.1.pkl"}, 0, 1, FLAGS},
++    {"model_path",  "Set the model to be used for computing vmaf.",                     OFFSET(model_path), AV_OPT_TYPE_STRING, {.str="/usr/share/model/vmaf_v0.6.1.json"}, 0, 1, FLAGS},
      {"log_path",  "Set the file path to be used to store logs.",                        OFFSET(log_path), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 1, FLAGS},
      {"log_fmt",  "Set the format of the log (csv, json or xml).",                       OFFSET(log_fmt), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 1, FLAGS},
      {"enable_transform",  "Enables transform for computing vmaf.",                      OFFSET(enable_transform), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},